From Greek: para allelois beside one another. Lines are parallel if they lie in the same plane, and are the same distance apart over their entire length. Try this Drag any orange dot at the points P or Q. As the line PQ moves, the line RS will remain parallel to it. Parallel lines remain the same distance apart over their entire length.
It is important to know whether the cancer has got into the lymph glands because they are one of the main mechanisms by which the cancer can spread to other parts of the body. As long as the spread is just to the lymph glands near to the colon then this would indicate Stage 3 cancer.
Cancer in the lymph nodes. Some cancers can cause swelling of the lymph nodes. Cancer may start in the lymph nodes or, more commonly, it spreads there from somewhere else. Pain or swelling in the area of the lymph nodes is a common symptom of cancer that starts in the lymphatic system, such as non-Hodgkin lymphoma and Hodgkin lymphoma.